I didn't know the name of this little bird at the time when I posted it. The red spot on the top of the head was questioned by a coupled of people: Is it a paint that the bird somehow got it somewhere? I was confused also and thought that might be indeed a touch of red paint that the naughty bird got.

One day, I was surprised when I looked at a pic of another similar bird shot somewhere else. I vaguely see some red spot on the top the head, which made me so delight.

Finally I found the name of this bird on the web, Ruby-Crowned Kinglet. The bird is usually shy to show the ruby crown and you need some luck to see it.